Imperial Tropicals Ink Fin Calvus
Calvus are best maintained as a single pair, but can be maintained in groups if in large enough aquaria. They are not particularly territorial and can make a good addition to a community of Tanganyikan species. However, they should not be kept with any small fish that could be considered food. It is not recommended to keep them with Tropheus or any other species requiring a low protein diet. These fish grow very slowly, with some taking years to reach maturity.
In the wild, calvus are ambush predators that wait in crevices between rocks until prey comes by. Once prey approaches, their mouth extends to nearly the size of the tallest part of their body in a fast motion, engulfing the prey. These crevices are also used for spawning, with both parents participating in the process.
| Key Features | Details |
|---|---|
| Behavior | Amphibious predator, non-territorial, good for community tanks |
| Growth Rate | Very slow; years to reach maturity |
| Compatibility | Best with Tanganyikan species; avoid small or low-protein diet fish |
| Spawning Habitat | Crevices between rocks |
FAQ
Can Calvus be kept in a community tank with other fish?
Yes, Calvus can be kept in a community tank with other Tanganyikan species. They are not particularly territorial and do well in groups provided the tank is large enough. Avoid keeping them with small fish that could be eaten.
How long does it take for a Calvus to mature?
Calvus grow very slowly and can take several years to reach maturity.
Are Calvus suitable for beginners?
Please contact customer service
Stephanie Chapman –
I kept a pair in a 120-gallon tank with other Tanganyikan species. They’re quiet and don’t fight over space. The fish are active at night, hunting in the rock crevices. Took over three years to see any noticeable growth. Good for experienced aquarists who understand slow-growing species.
Virginia Butler –
The Ink Fin Calvus are peaceful and blend well with my Tanganyikan cichlids. They don’t dominate the tank and only show interest in larger fish. I appreciate their unique hunting behavior. Growth is slow, but the fish are fascinating to watch.
Joanne Mathis –
They are not aggressive, but I had to make sure the tank had plenty of rock crevices. I noticed they don’t eat much and need a protein-rich diet. Took over four years to see any visible change in size.